In this paper, we present a novel energy efficient routing protocol for mobile ad hoc networks. This protocol is particularly designed for dense networks. Node location information is used to simplify routing strategy. Only a small number of nodes are involved in one routing. This reduces the routing overhead and saves energy for other nodes. We conduct extensive simulations to study the performance of the routing protocol, and compare the performance with LAR routing protocol. The simulation results demonstrate that the routing protocol has very good performance and good scalability. Both the computation and simulation show that the routing protocol incurs only about 25% of the routing overhead of LAR routing protocol.